By Olen L. Riggs Jr., Carl E. Locke, Norman E. Hamner (auth.)
The ambitions of this ebook are to provide technical information regarding anodic seasoned tection, clarify how fiscal analyses are made to figure out even if it's going to be used, and describe many of the functions and gear. Lim itations of the method may be mentioned. Technological adjustments that experience led to greater temperatures, pres sures, and velocities raise corrosion charges and markedly impression fabrics choice and layout judgements. non-stop cycle platforms impose elevated calls for on method reliability. New strategies require extra subtle apparatus made up of dearer metals that are usually in brief provide and topic to the vagaries of foreign trade. The influence of continuous inflation affects judgements on the topic of capital charges and upkeep bills. a few difficulties attributable to those concerns should be solved, or strategies simplified, by way of anodic safeguard. Technical and clinical details is gifted on purposes to business gear, economics, layout and deploy, operation and upkeep, electrochemical ideas, laboratory checks and systems. A old precis, patent checklist, word list of phrases, and a subject matter index are incorporated. it is very important recognize that a lot of the data has been from the unique paintings of others, together with the guides of many friends.
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Additional resources for Anodic Protection: Theory and Practice in the Prevention of Corrosion
Figure 2-7 is a plot of the iron content of 94% acid stored in a carbon steel tank with and without anodic protection. These data also indicate that, at a temperature of HAS BEEN REPORTED AS HIGH AS 1273 PPM 1200 1000. E a.. a.. 800 I • Z Z oa: 600 400 -NEW LOAD OF OLEUM AND BEGAN ANODIC PROTECTION 200 100 /MINIMUM IRON REMAINED 1 WEEK /(39-41 PPM) 50~~~ .. ~~~~±==±==~~=x~==~~~~~~ 00 2 3 4 5 6 7 8 9 10 TIME IN MONTHS Figure 2-6. ' 11 12 Anodic Protection of Industrial Equipment 25 TABLE 2-1. Anodic Protection of Steel Storage Tanks Containing Sulfuric Acid at Ambient Temperatures Concentration (%) References Oleum 100' 98 93 90-94 77-oleum 11,12 4 10,12-15 3,5,16,17 16-25 19 TABLE 2-2.
89 aSummari7cd data from Table I in Reference 43. b'l:: 1925 ammonia: 65-68 ammonium nitrate; + or - 6 urea; 6 109 water. 228 mAIm' Current density TABLE 2-8. 6-508 22-1676 IL/yr Vapor-phase rate TABLE 2-9. ed from Table I in Reference 44. 38 rnA/m2) cathodic. 08 A/ m'). Passive film life. days': 9- 30. CAl end of 24-hr lest. alion curves. 'From 30-day tests with coupons initially passivated for one hour. iApproximalely 24-hr tests. 'Active to saturated calomel electrode al 27"C. TABLE 2-9B. 4-203 24 hrs 8-135 203-343 7 days 19-94 483-610 'Summarized from Table I in Reference 44.
22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. 47. 48. 49. 50. 51. L. Schuyler, JII, Mater. Perform. 18(8), 9-16 (1979). L. , M. L. Conger, Corrosion 16(2), 47t (1960). D. Sudbury, CE. Locke, and D. Coldiron, Chem. Process. 23, February 1963. M. Kolotyrkin, et al .. Zashch. Met. 7(6),722 (1971). D. Sudbury, and CE. Locke, Oil Gas J. 61(43), III (1963). CE. Locke, M. L. Conger, Chem. Eng. Prog. 56(11),50 (1960). CE. Locke, Tappi 49(1), 61A (1966).